U.S. stock index futures indicated a lower open Tuesday, amid a wider "risk-off" move in global markets that saw the yield on benchmark German government paper fall into negative territory for the first time.
In U.S. economic news, retail sales rose a more-than-expected 0.5 percent in May. Ex-autos, gasoline, building materials and food services, retail sales rose 0.4 percent.
Import prices rose 1.4 percent, their largest gain in more than four years, while export prices jumped 1.1 percent in May. Business inventories data are due at 10 a.m. ET.
The U.S. dollar index held higher, while Treasury yields traded lower as of 9:10 a.m. ET.
Safe haven assets were in vogue with global equities selling off and the oil price falling Tuesday as the U.S. dollar rose higher. Investors have spoken of concerns over amid global growth concerns and jitters over the U.K.'s upcoming referendum on its European Union membership.
At around 8.30 a.m. London time, the 10-year German bund yield hit zero and briefly fell into negative territory. Bond prices and yields move in opposite directions and a negative yield implies that investors are effectively paying the German government for the privilege of parking their cash.
A spokesperson for the German Federal Debt Agency spoke immediately after the milestone was reached, stating that the tradability of federal securities is "still very high."